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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857532cff2f47f762a2302dfd6a9e24777cbad5afa07c8f02565256edd250733' 
  AND token = 'PT/29qEplGABzbFkv7hY5Ym90NbaQ9j5lYrEbHq5e1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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