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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247e4e1ad054b69f2637fe95c3ab71e2ca8425de34f05d4ec3d62140f4121b02' 
  AND token = 'YBrr/Nn7B1o9npXhv/wPm1YmQGG0T8eRQeQ3vbieObI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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