SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac2e291b1c0c69fdf3f421b1389bcd917299c608544ff82ac2fe753c05ffc3c' 
  AND token = 'VTt7UA5Bi6PHYyob89wLEKoGRnq7g83I3vXISM+WTkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables