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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809cdb05a9abec9a2d18b557283f04342276373f627a72a24f151405f18a0658' 
  AND token = 'yu/kq34nxsYW5yPLDlKM1gPpIf8BQgOklU3PanmVHBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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