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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bc21ac3528f0b52dcfe0ace51402868c08ef17b9804be61a59551ed2ef1d43' 
  AND token = '83qr0xh+OEIlDlMM4RSXtSyVSaUK5HTc/yfQD98aHK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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