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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664b1f54e7d60ed81275b15e2d79854fdb2fbfbf76a9587eb0cb1d3d8b002db9' 
  AND token = 'KT4xxKn1lszxGvi2n9vmV4fAdcdEqsSIF3sNprEfTr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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