SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052b42573368275fc4af06aa8bb63c98c1fd4e666510a8d9ec40f2900b1e0b18' 
  AND token = 'jhiQTXc1d7h17hieWmKeY6CCHroghQ3AlRRX/MekR70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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