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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eae8cfb1f9d9b82a2d6e30a59b8974efc3f03b6269e8dff5a41ab3485931d31' 
  AND token = 'xwJe914ErMWFJQ1bwxU6Bffm2g+GwwsDeZnVIL1heZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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