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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8e63108a490d6f057233a26486f01b1302136a1ddb90b59b6b1b664bb46804' 
  AND token = 'NiKVoTnjD21AM64rz66g/SM9/7FqV2G0YarXiItpCkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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