SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ce107ff8d6065914da3371512342024de8e9cf2417e2d3a6a0bbcfd0f48198' 
  AND token = 'Gabf0osHmY5/HvQOOb1dixuUQ2Q/8n1nru9phA1H7/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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