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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271aeac923d698795f7aa69d37a8fccae133748198ef5ff444501a5e2732a3ae' 
  AND token = 'r9Z3bX3uIkZU8K4W35yqFXkLIZA1tbl7auy/5phqgWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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