SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f96b664fcbc9b27cb401d5a7b00e3894eb3b0d434263bcfc48e07d4712314e1' 
  AND token = '6/lmMUHxREqgg2Hx1vtiKH619nAsT72W+9W97FX/Qc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

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