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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1db5c7f4f947c77085dd17a5152c10b28f26ba0d044386d25872aac425ee34' 
  AND token = 'v3kblfHaVUrzEuf3PgU5S4qIB5iQvH0Yb9u66KpOSw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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