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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811722659504a71b23f9d52842c51271361a9ea0a3158ee991bd2be26ab63f48' 
  AND token = 'fZNMyWbt81wsXbe//5G7UDr8jZR8BBP7p7POXWdijkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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