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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4ef1cd5ab400c4bea2ccc7e48f351546bff8eb0989865b78289fe7f40a2514' 
  AND token = 'cKovCc6nU6gs1afgGXbRhHKI2abuy7l1S3b8bLafT9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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