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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ad291326d2fee8163eff2cec1b4eceb776857c68a3b5a4a7637006b7e5aa6b' 
  AND token = 'nIrzq57Y3PgbInn/aeK2HZpoFEVuktXMsZ5SYT5YJA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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