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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29dc84f88f49cd76a528fd21371abc565467552e67b15e22e2ecdd81619ccfbf' 
  AND token = '929vGj93jtv/VpKSOh1Y95rHU/ctKYgOg1r7ehTygxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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