SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f215126b68ad48cf094d057cdfcefeedcb2e61813c7dbc39d2eb74476682399c' 
  AND token = 'bsstaA61JgZjDvdCqLUuq1TFNzobH9KvHydCPt5LE+w=' 
  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