SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ce31afb27986b95eba307cf6b181440c67cfbf3f9bbc54cb909feaa046f545' 
  AND token = 'Ax35gFPzT5LjLsN3PnV4XqXc+71wa2raGKJuCuiMhHU=' 
  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