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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205725c76ffae16b41eb5c011575b56c12e34646e3a015a973f6434d40d010de' 
  AND token = 'viFedbfegrReGkuCFuSbE4OhIG05MQjC1u5DuV1TXMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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