SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06293b7a7187d27cbfe6186d678e306ab7a11e303543b5e4554f43baaa75fe8' 
  AND token = 'T9Q3LyMIRk9Vtq1+eXgC9y/OrFx/eNsUU66E5giD2VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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