SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647096dc4d792ca5c3af0dd8fdb3b9445da18e687e4e16e1aa75a249570fb10b' 
  AND token = 'iu5Yn/RFrArGvnad5l6cRyS/G7dorhRpH5OMn417G1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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