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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47346650b1ab9c2bbcd7ff640ed29b73c4155e2affc9b28bcd4c92e08868a803' 
  AND token = 'ADbbie3NrPbSTCWlBScp00iHftnIj/dZlMH+B5EBj1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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