SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8607b7c95fb57781e61f38ce7867d4f40a64d7beae397e3404aae01244562ec' 
  AND token = '6Hc8RBc0gUAJZ2QRxz+3+ZRBK+7BykF1wa2X9cTJA2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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