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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931558d606f9253b61c9100f238afeae7afc812ae6c50719beab853753954757' 
  AND token = 'osD63KwPQF60+wbyO/L/65Y+0wQzAH8Cyj5tucCKQfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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