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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850aad13d7b634fb393ac7f215c6124e6ef8730612f081e9d7982682c09ac67c' 
  AND token = 'Ngy7DawF/S9lEZACo24uHVIyxoHb5jLmV1GGtbfAxcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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