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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ab16b8c8283f4f6f6bb5b1cbc5a141941fe7685665a052c96671aaf15643a1' 
  AND token = 'CT074zL4OBP2S3CLmz8HZbP8bE/TgyQcDi5kd7wuGwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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