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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056cbb4557017d426d96c949b4a63567a3a58bfd592ed439fc430d741663814c' 
  AND token = '9qixXSgmrDLG8bo7X7fqMAvzSENBYNDHmVOkLrDZ644=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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