SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fce8bc9446452ae33c542af0b41dd85e2783ee203e50acba228c8b0ba4fe2a3' 
  AND token = 'jII4B+VRa/e3AGUCjH0ePh4DB4borVkQhLMxKPH2vVU=' 
  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