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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629f8cfc9a05e35ea2be5dcc0fa82dec0a93f7a14063978931f3cbf35dbbaf58' 
  AND token = 'aGvPpJRo3yQ+gdorKO95X57WSc+SHTdc/31kXSn6YPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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