SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6465166ab96904fe88802eff9693fa7246d95ec1cd7373e2507701bd3e715733' 
  AND token = '6PMlS2BRHSx4qlkYZyjwGggUmWIzflP4KKI9BtpX3vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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