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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4f359a2907dd48498510f1b137c5b9fe11ee90b7c042173e078862e2d4f37c' 
  AND token = 'vfemCWbiVYCVr8WeuEv/52w2iE4jyPW8ztkGONKWXQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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