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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29789ec504305d4a670faa23ab03b7da85d887452fb7336eda697691bc37213f' 
  AND token = 'pOeDYj72SW0kRER1KOUavF2vKtz706KMy9I37LiVGZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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