SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b1d48fc0bb083b97083e5aab4309d5d2fbf1067eaabb5fab97f9ebf46a028f' 
  AND token = 'BNYm5qEM/iQvOKAdj/dOsg89Zz+PZrc8lVnhaw1x0E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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