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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06e695a74194671daf741bc3ef3e40d255a3e17ea9768cc463b1e4651555fed' 
  AND token = 'jj2yOiZ4XtNpTGH3r5c76XBS/u49vYoUp0Euae4VumY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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