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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabee03e5fe584348ad7121bda364235fa853a7b606e660f169b9e70c16bb6fa' 
  AND token = 'DK4AvtR4xE2N25nCxxck7acf8qxX9vlEZTv27PiDLak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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