Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e98c59d4bbb7974cef3a7ceeb1abc12086644439ed028e7d68830d3506ced0a' 
  AND token = '+CU4ijaMAmrIUImyt6bGpoyWKqhc8cp4sHlz9TTTRl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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