SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e2aa0bc21c70d69b78fbee8732db7642221bcd64506c1fc21f107e743a02fb' 
  AND token = 'o6SNTFis+wvFeUU/+sUIl5TY2nalsJvnZEocO8CHkgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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