SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ac3331a7d2b2aeee00658249c6b8e6f12e445223a9e39d73071b423f3aba1f' 
  AND token = '5LPHWl02i9PT5E3Qn55aokyo3oZkaWi/RWvB4xnnEr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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