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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5272ade83dcbe738f4417079f10b74bca48b51d11f666edfaa224b4f4faf4b8b' 
  AND token = '86nJKhun+AmYFCamKRdh2y/ckJbLq5MC/oD4OFuctfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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