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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5edd3f9c0a2a8464cde8781ef86990d171e4ef2a013863fdf9c1a05587aa4d' 
  AND token = 'TdnN8HpE7HFc+7t44Wvzvfosbt+B0enbKclgQS0R6g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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