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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd928ec581333ba0dcd7a70e63f9bac8ce8ec81e9eb1f41e78055ac1a3df5ca43' 
  AND token = 'EkS7gEWPO2XVQLDlXjS9VSLYi5a7Q1CQdQwaJZ2bfSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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