SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92adc2d487fd6fc953d76e06fa7901ede26591fc6f54d07628dcda05b95d201e' 
  AND token = 'ttw9OPE9/iwn4mLZAm3iy0XZ9ddBwkuU+RUkcDK2ZFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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