SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee66cce9fd67f84bdc11282bcfe815265daaff2175a798a0e0de92320186a809' 
  AND token = '2TRfVuB9tAm3CCURmNvBLV3/52PaCxBmIGpCm/2onpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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