SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5277d7c7a76c852927d671322dbab12c5b2aa1bdab635b254c87e88f0f37da' 
  AND token = 'HWaZyIAaX+nnhLH+rCb6cdTw2sxR5SwmLnxAEEA6IwI=' 
  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