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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99846d3b7998f6adb7b5f4377da9ab6ffa275deae5fdf93ddca6cc8a1f389683' 
  AND token = '9cPZqJDM9ZFXYHVo2ir3s7PCmlABz0Yyo0iJkxobnjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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