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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf6c2631f8fafa41bb6a833b58fcb313049cff4fa4dd332329393d0f99712d6' 
  AND token = 'lGILSTEVNlPfzgHQoxwO7zjk8GLK72xZy3kgTJ99Yro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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