SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b70ca7d2c56a610b79f38ae3c246d31969393ff919cae3f5e1647bcd275566' 
  AND token = 'knQqJRyL5meq58ZJ7Y1FNNvgQjwAuCrHPTSOP8+zm7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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