SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e61f8f12b9df38bf184655a7708553ead9df5d55b9a4609125bc9e7e4b461d5' 
  AND token = 'fXVr9U0vvi3OCP227+JeqC5hDMn1Hyup4xOuF1gF3Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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