Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3798bcd599cc527d85cc8eed7bed3ed395f753bce34f6f77ace8bcad271af5e6' 
  AND token = 'XiCC2BTmiywrBZ1CSbNxlrlhrbQEQFIm1pRKztfyxTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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