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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4147bec690873588dd430f1677473611dc3adab33bd5b9e3ac07015376a89f' 
  AND token = 'rSfGBtVQrcQfwKE7XrLHSsj5UWdww8jkA4IpkzhNwng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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