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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ab4621bcefb38e437aba086b0ee66991f097b7a18fc78305b04a4317d21e97' 
  AND token = 'aoLaR914w57rIVusrLsPxF4ps3JazB76dkunZSS/mGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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