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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf94eef2225618c501e10900efece828b79a6cdc091aa2ca371d32e3c7c5d29d' 
  AND token = 'RuZ9gDiAA8poWKtHqiLcWBk+Stml3t+sTvgZLSPxJRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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