SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2502a30b10c858f4f73460d3d81116b020b342d9da223094c82e8f2c55a9397' 
  AND token = 'pXvU/ulpZ2mN7DjuuC8QgGL2g4E+Pqv6luUgPTkKF94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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