SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04abcaa295154e6468cffb5bea35dbe6ee00cf41d268527a8e1c440e9c8e9ad1' 
  AND token = 'P8QbJx/qY8YBeF6hpCv+k/YjtDerGzU0vB3MYVJBsjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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