SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e0a46dc5201a3a3d7db855712bb06f6cc1a44883fb745e6a3c82bbd033b411' 
  AND token = 'phZqsadkQ9pQNJC/gEBMrzGEJgGfvHfSS5xBUQQ9r8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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