SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99e9da4a16b92f5041af8187fd52390ce784d6e52b6e762af23b6559156f690' 
  AND token = '3/4vOayBn7vHzr7NVMZl8L/BwYRsQW6gPcBsiZgz2CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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