SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904a6912f67df87a994795593c8f307bfbb368b58fddf320eefb1e5e220cf64c' 
  AND token = 'gNQuR13vqiRL9vmzt/A38A+9sv84NEyFXLqqxD9vdjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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