SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c388e6469e679f65b4e14f8e8cc09eb52292d1fabc51ef382a1e280748ee393' 
  AND token = 'v1e8RCnKHimfSRvTpdD/v8JmNWlNz0KHN3FqtHB0ORE=' 
  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