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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534a4f49d6edbfd9ed20f3611bce5205fb59e308d6a5d3c6fb8ddc6a906f8abb' 
  AND token = 'x18EOT2U77ZTbK/PuQiilWh8AQzHqJeVPNjY6NrTTDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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