SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f116340634ce981f5f7f3ef63cda21ff86d8fe406024e2d173a61972d7f701c0' 
  AND token = 'SDkhXoTYqMJA8kdmMbvk/icD5Mppd8pFP2hrwvylTO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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