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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0848ef47d284d379dc4d0ca8aa36cc9709ffde35f496105fc84df2fe4f75c23' 
  AND token = 'YwnevQe2oCOOZnrgcgA03eEBaKb2doNbTz/XD2HdYnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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