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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ecb84f46a88661d5deca371832fe9856a4afe24180b8906084361c4928004d' 
  AND token = 'WpwoVG6ulyW39fe4vs94e2TOafaP0Mp8vxPYa9iCOQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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