SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c2f405e71b9ffa5dcf2d0708b6d8b5f679b138c5b9269459e790f6f95d29c0' 
  AND token = 'hcxugeusGV1cZW3Yjz9UPchlJ63GpvTj1oOegag7+AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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