SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aad0265517ee1806ab347e5ade11354f4fa66879042ed8c93ad37f2921c3a4b' 
  AND token = 'Qpruv0cJlskrB5FGqPziF65GJVHSpMoqXOfh2ZVzedA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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