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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333eff87eba8f19bd4ff4906862cbf5dce9c91e3e43b321e6d27fbb21cb5cd43' 
  AND token = 'XuUki8lxRr/x2AI8ae7z473oraz1V7p3udrKsFNMdDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}