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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714795278fb9b6e9ce9d2dbe01967d898960bdf111fe9e341837dc04ffebd563' 
  AND token = '/VKj8FGACRCd2COxAeY12ptFmy2TQuaw1gObzmQmE6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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