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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cfbefcb80bc23a67879db97089c5948626f866e5802cd0fa3cfa4befc7128c' 
  AND token = 'UohTkGWjaBTdtXX6VAcdiQdyf8DBW169Ip7GtuY/goU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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