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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7fc1e4008ce20c5fce78eaedad9347b794c9f155ba29cdd2e9408bdaf3b068f' 
  AND token = 'EZrXk7s7O0rVc6/mcur0WeV9ByxMEUie+g+gFBkfcEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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