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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf6c2db009871cc6ac28a05a5adfb08e30ccebdbd82fcd8b570d962c60d9082' 
  AND token = '6jfENy14Jw33fh2X21mXHUleo7ZQwxqBnj6ItGGrIGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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