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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a75cd5820d3dd3e93b73a77784801f02c6a64ca9ae75ac7040f2eebd6cfa2f' 
  AND token = 'sZGiQKa2gfT5CJId2oNfzuZNwMl3LRonZYo2dX/NFxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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