Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1dd75bd7243d7d4c4fdf5c25d1b6ebf66127c6433e394fa06f5bc3ecc494564' 
  AND token = 'cxaxEWE/i+s3HUnTdBWQaeEfeKwsY5p6VYTjBW256N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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