SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd40abce7de853831469371b08a4ef3ba4bdb78a0e5d2cb37d2d8f1b87fb10e' 
  AND token = 'e2guyDiorkIsSZL6E6kpSNz+f3+6OA406QEV4ZAGvk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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