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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369a881081b38f2f10721da2dd1d8b03e1859856993584889d58abaf38fb98fb' 
  AND token = 'nDBVQHWcUuiDn8U18Ja5ARTL2itIzJcMbmZK2NbDaJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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