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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be24d8e7fed62ee0b6aa5536ca1db979503af78522039cc06613a418b147e784' 
  AND token = '3Nte6FyVm+7zPdTpcbnXyevzkFcUTwq1we62bCNzrfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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