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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d50f6dc22c1ab40912d17f3d40598beb9979d3c293eae95806d3a116021dad' 
  AND token = '3hQANFzZX8JjwOMOpCj9Mv9HKFv282ZhDou6PbLkcXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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