SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f842e798a479c5dd0846be94b27b39fc6220d9ca507fcf0152219d8f247b570c' 
  AND token = 'oNXypqs8XV7QlnWXYNRChOFvTyZZGW6fKKUOLBo24tQ=' 
  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