SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5f34bad8c8384ba7fd6da0f2223b717db380148a912abceed145c20fa96b13' 
  AND token = '6hoKEJBykpQWKICyqUV8VvP41LeIaFX+Di+ywvITu2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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