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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617cdfaa4f5e8a4c544d91593daa905ae5ad680db04f9356b20b26cbd6e6045d' 
  AND token = 'upZ/CYz+aokjFF7K47fXeyAE6Oj/IALevWKsrsJO43o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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