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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4714ab6af9c0fbfe7edefd77e6b095b82e355ab0d2ada1aae90fb4942cc3a3d2' 
  AND token = 'Xl7NG9xfr3fZby0fILMHsvj7sHI1h2QbomRuQ3UwMck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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