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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d16c0c25ccad5fbb8cf23595ae311a2d9a57f3ca6de383cf3e14b79e30d7fd3' 
  AND token = 'n9su520SqxwDcDHzkudxhbwgeTGOyJ66hG4PFuHrM2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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