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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84be2f15715dd27729606131ccc82cb1b3e3503b79de20b5488d3f2d1b23065a' 
  AND token = 'b7zBpnICUdpaHHYer3xR7I6Xt28EYh5WZ12FY1hlSX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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