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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e8085f119cf38db490c283cc10095b2401ab0f83f08bf60ccc86d12dc2a028' 
  AND token = 'gxCVYJ6Pv2aY63E60YwCe7pxcw27JRvfl+PTJDptN3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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