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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80be5f4f10e8d8530214f532c0c82c768aed718a396577f479fedb0e9ceee451' 
  AND token = 'QaFcEvJpwd9gWoGZdZHA/rhRZq7UZVOpcem3M12cukg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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