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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f5b1b21f58f0bee21b6ddbcb20326bcf1e4d1724c8921e16d3bcfee2e924ac' 
  AND token = 'K9Q+hma21plrI/1W1KgL/6gH/78CD4vD2wuIiil+mto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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