SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a9775e831b662b4f7943ede3ce6acb43ff9de8bf55861be2de05c424f2c9c0' 
  AND token = 'UvKmVK7YeFos6+KlI8vjQGi+rGV466MDTK/tqeB3Ggw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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