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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c17639d5448435b3368a105c85264c6bf9f09ff90e4514ff63648ef8a103e9' 
  AND token = 'MhtvuRzZOpv5z7MplNcP9jrsK81eK5pMVOcg4j9KzGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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