SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e886a36c362bfa3be38799cb6f00aaffd1b7e1b30c4da7b60c433851fd556a8f' 
  AND token = 'V42pGnPM3nx49GY3uosBuP/iPWcDhxp9w1Ki/KooHvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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