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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768ddfe84f6cf033028b0daa1a866a26481e87514c9f53ce985983a93a6c4d4f' 
  AND token = 'mnVuZqxh31zvFtCbk6YZ3R4LoLcJTsiQYt67RngTv1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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