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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df42f12d8c5bdecc8dfd2df548b427e17f899d7732136c14408684f12c1ff9c' 
  AND token = '00zB5wnZUzNC1x8zjVKyee0p9CigleQ+o7uQo/jkBuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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