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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c8bd1ca6f38068a132ca751738a253025322052a4f33cb9b7b536b1b2345b4' 
  AND token = 'VD2Nr3pDLf6DLR1HEJqlzZ6I7z76QbYYpibEReGlBMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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