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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3dfc987469c084be309796c4f95473b40ec24a9bae2122e3315bb8b6c7dce04' 
  AND token = 'S1xXwZes2X3w2vG5rqKkjg64/ZPhWYDNU9w9u6t4PAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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