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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3b82ec92f433e1cffc51de0f69b2b232a648a396da8a9d23df18fb44200a47' 
  AND token = 'a3nUpMAuTeUhiSBR5SisI/YnNSnUxtDSnqxavKzJhS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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