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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f298c0aee1c092e43a42e728ceda165ef5232427bfa7216ada83852806684f53' 
  AND token = 'aDsVswgbwc+H8nfWHgHmq1OtxA9YWAuLyMsSFvd3YMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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