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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7984e8d3d5729575a77f96d12b921c9713f0a41a87abc7b6141a6c8dea75c0a4' 
  AND token = 'lIoyV0tcBj9XZoicMaWqI0UHPmvp/xPwsdxAMrpxdPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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