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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a7ce6f21c40572ff92659b4ddaaed99861154627ea30b3923d774a04aea3bc' 
  AND token = 'qJ19xbz8y2uCrxyVUMlELr03Svrv4PcDQOx59VhCXPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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