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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25760947649644c589b5a9eee5cdc55d1316149bc3de40b9370873af241d68e' 
  AND token = 'blR5CN5NP/KLRXCbp/zJrJBr5LtSrv7rG8IyDrXHs7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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