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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519b50f760080b5c85197c8ea797c358a837b02ef924a83aa548495c3653caae' 
  AND token = 'SFkgH5c6gN+5xe8O7mva2QDBX91nAzwMWgKgs843RFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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