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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26eca47b8cd20673b88dc8dc5c484abf2e76391f09decf586df7d8f6a2271cb3' 
  AND token = 'iHb44mIkliO5pz0dlQgiKG+RAPk1wggM0ezlHqZZqZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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