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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf21559af904469ac1d92e700bd344d70d385f9bf300c7b5d246507e6bfc1621' 
  AND token = 'P82uVgoBkik9mrkGzR+umtImU2W0jz5SEcbrYu3DlWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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