SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2110f4b709a8466784cff86d84130840dc688d9ab1f43b74b8190e72d692f9a' 
  AND token = 'e+WudLXvUPfb9dcJyLF5o9xxgTns6ZF/05M9pG74Nac=' 
  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