SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8530cf8123c75fbc8f244954f65dc0b7ea2f0a73680d788539f9e4c0df07444f' 
  AND token = 'GdLLw09hJmQ14zVQiEQC/2k9INUCtKShawu+/2Yd+Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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