SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b814dd485f3adb0befe8508dd959ea41c4394d5967391d754ac53dc540da5ce' 
  AND token = 'hlHX8u/Z9gMeQtstg4I2m71OMeqqNNfZRNEfk5t3fu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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