SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eebbca8837295f9891c6180b5a8efdfd667b2c8f36ef3e3fa0cba82a43013d9' 
  AND token = 'DigY/Kv+8JKTGJPenVzWvPq4xk+iYLrydmGm0LxzL+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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