SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebda15c9ef7bee641616bbca815e05922b01f25d09571e15153d2768779b6153' 
  AND token = 'wdgiXpQHZUP8mbi2SaRPk27+VXNFDmaXXnWCaQojKWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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