SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3795a2ead6835f885f98d4b5cde62c95a579872d4545b81972a7cf284d35b053' 
  AND token = 'f3FZso82Ey0qlOk+Qn9alfYCs93RHh0pFvM24gEgRgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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