SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3532b7b3b998e233bc795981b31995aecd7e57432b4b8f5f54ee88cfd752fe2' 
  AND token = 'hVU5TFsGz1iJAbX4MHeH+XAcuBEPsiXfwb/Jb70Ar5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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