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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bed95f55da865a6cc0d4f1b6c5cf7de46eea1c7fcd61ba187d8089e4eb440a8' 
  AND token = 'Y6j38iVNq7zFUPF35b6ay5NcOYnjhTmeNyfbrHqvmmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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