SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69e24e9c56ddc779a7fb1f50ca48161b28b16a2b57d102b0fc39747a83b6ca2' 
  AND token = 'GmF/GXH6hiSnC3KBmZXGPS24buKQekZ0R+pwCPvcR/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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