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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b707c3385627a7177b53e43857c45465536c23f07573911c711540fc420cc2' 
  AND token = 'EO1183tEkjEQiLa/FumfP+4dZrxah1bXfzJP0dnKObw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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