SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6aae2b0536917f09812f40fcbc39f68b5303bb192df4f0c648e978a6244e9e' 
  AND token = 'xJmAHStrivlgoi+fSWGTOkyMjhmZPoYn3I3s8hzfG1A=' 
  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