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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9472023ec2dd0c72b5686a5dceba03922d98e5e0b02be5ced4bec256108276' 
  AND token = 'KlDmjH6XQFLbvn+LXmH0NAp+vn37stVSrkn7exbsYW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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