SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f8bcb00174b4d1a7f2520afbfcaabfe88891537b42ecd657e748f77abffdaf' 
  AND token = '6W4+XMip3B552K0cp4PSSiwYOJt9r395mCuXamf6xCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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