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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25916d41eda0a18dae87a2089778b5fe06d3451ec28a2f475a6b6dee087b17a7' 
  AND token = 'JmLpeDKvg8e1CAtKkHFr+FJ/G8EcoDwLPyzGLE0Na90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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