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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42bd1475589416b5bb79ed588035a996f24e64b322d136ab3ef6d263b092643' 
  AND token = '1G2shn1vFsvT58yYQlZsdMUdJyFXkUGfCfFUWS0VZoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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