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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862d3a6662bee23a8ea90c94fd3d080e01f9fc0c5a8f09b80a8f829eb6a2db78' 
  AND token = 'tvkrZl/9QypOuQ87UTW+4zxVYexXlAwfJPA8WU1EwMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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