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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fd62454c732ee2cef86fc7afca7f3549cfdc3abea2ab884eeecf0ba92647ae' 
  AND token = 'HQL3eE+IUhE/4g5YWQ+ygpn02CAX9i9yHQMlq/9AnZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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