SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0823d78fd4f15ac3320a3ee62ba911a1a8f5dd78b35142ffe343d769891bba' 
  AND token = '+ZJHyVeciPfut/Nkk0wVMnWmQzeyLVvLylFsctd9bTg=' 
  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