SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d644f4877e3c1be2a0b6994bf5cbd0547b25b3b8bfec4ba9855c79a7701887' 
  AND token = 'AZMBGxSJkA1rcTMh1eOPq/gby2vsGmwpvxtiJFIwUJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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