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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b184d6fe70f474a758079150cb65c7c2ffa76900a1c43d3215a051a1e54437d6' 
  AND token = 'bkC0uwsAO02CqYBmgUVDdBTlXcywKf0tD+bPIsN/9ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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