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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65cbb6c3eda35c0fb5dad134818ef326d8f6d097a5ca46121e05eb28280b2d77' 
  AND token = 'Xome98Z8ImgDD95GvmTcFl97xpjU/35OkQnPcQqGwQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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