SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3395f638fc4d69b57d0fba7532c2490ca2b3083b1133b73c65f719c84e68f0' 
  AND token = 'FA6wUoVt7pi6/YGX5HcGpQmBWNzpvHUBh9DdwzRBF60=' 
  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