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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55af034bd6cd412d2eb0579de0bcec1e6142e7381b855ea7960aeeb31f1acca' 
  AND token = 'EIkHERT4AivN068dsgHdNQbGnbe4PBvwcr96ujtSj8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}