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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee33c429f7e0d718409c078ec6c49bacc919ef99073f191a8c3ccbfc1f3e7364' 
  AND token = 'cGSQfr112F8/1d/kZrPH8yN8Ne/1oTfU0lgZqF8AjnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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