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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f10517978c65e6a3d45d6841306436046f40ecb1d0c8a00dbd8a4a42d89283' 
  AND token = 'LtOI8Sqo+7gHn097/iajw5Unx+imPNZsyxUUt7WuZyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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