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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022edc234a190e494093bd79ab90f7c370aba4f670b5294b202c198cbba0c989' 
  AND token = 'aEAAjxCCAv/fcybRVdx06vcG/pa8OKIfwYAEIYo0QhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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