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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd098c803e95c38867c0f1adc64e22b6938877fa51ee5acf52064417af8bcc8' 
  AND token = 'xvIyQNhhm6Lssk6jCH+qM4GPq1ollyhUl8/x0wECjHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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