SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617ba3dbf53e63de39a1952bde6857afef66e98aa3358e408213b2ec4595b19c' 
  AND token = '0YcAlgopMz3V+RC1JCfn2HusB60TGAXLxlIQJp1t71s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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