SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '816f7e4ef66ade4f4f0823b6f0c86204ef9d818877dddf7ed5028423c080ca66' 
  AND token = 'P3lKTHVEHwqnFUkwQzOp+HLAc47HQcNKSfeWZfcUfSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

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