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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5985baa933e23633a4a02e255cba456740b6cba48ba43e0ee89827a0a7aea982' 
  AND token = 'pFoXpU/yZ0jr4jydoT0tvseZIYb85pIQWdVs/+xOKBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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