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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858d579623bc03c1c7fc37717008d046183a43fa8dd389cda9717adf6c723be9' 
  AND token = 'rBqUhu5MmlKcwujyweOeRct75pE6N2C/akJh7/Oa6AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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