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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5b1fd2817c30411e5160c2e4776b5cdbf0b99a73b7bbf27ca113deece8c329' 
  AND token = 'X1qltTvpipA0jFYN8cSvr5rzPoddOeWExgeKG7t9y2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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