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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0e1abfba83b3f2aaa10c9cadb7d3156d7f81d707416f46bcc100f7ea2f52e8' 
  AND token = 'FebBnzMX0YA+Mj25AiGNhrXMQkMXPnNMkIFuG4H1VjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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