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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79225d87903d51eadbd5635d4ddd6b131cad5373c6c28a58cd0f2e12a9003bb' 
  AND token = 'CoPEoncHvfVICLGl/A6vKAjYe4qN6Z0CACgBnWeJ6Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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