SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be58448c168aa108eaff35437e30a1bd69e73257d53288c8a4c8b6dbfe66ac8e' 
  AND token = 'C3w3gFQ2x7+u1Ih3yUY8mT3jzh9vTJOLB6DV0+uGLOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

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