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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31df434f9d71dc84f6877c59c6e2ad457d7aba581bcee352302df4a21bddadf' 
  AND token = '4FNzaxcP4nTsj2WimAgKeWZLgARL2tGbwqL/0/iTsl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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