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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657eff2bac907800214b9ce3afcf7200d9570a725cd91d7f7083ffa6719f9663' 
  AND token = 'rdYiTVUZMDAP+Z4BRZcZanMYmMSmy3CTiKlBFuMembc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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