Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a867a67183015094a58417a054104914bc474adc22aaabbe7d70108972ab4197' 
  AND token = 'VSedo6CYtrqTodsHkReBEyRRwnfehaPOgBPsYkJZoh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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