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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dd289924af6a6e3c9ca3d352c0a32dd8ac52bd4a17d927e758e632b00794d8' 
  AND token = 'jB4g4yTIUoMwLXQZ6NzlBKusanXrQZ/wCHWinKBlA38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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