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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00037abff960da91afdcb73c0c264073ed070bfdd082207d3567ac702a90675' 
  AND token = 'QP6ZtOkPqgbZ5jQxxmcPr56mw48cpIJfWe59BmZnS9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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