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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167bbcd5c82a2938d8bfe167a148cd3f82a43d32ad2c468bca1cd406cdd9e0d7' 
  AND token = 'gfqbuS8QZBsa9HxTk5lUo6VpGLuaMdVvqs2rbH67nyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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