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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18bba689c870962b7df121750db000420f7d338aeceb74dfcf227bc29e9f54bb' 
  AND token = 'Xjn6Q8an4iKiPW9X/G8b7k8o6U1UPL8qAkd1sU5Ll+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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